is not it hard to drive downtown to work yes that is why I ___to work by train

is not it hard to drive downtown to work yes that is why I ___to work by train

题目
is not it hard to drive downtown to work yes that is why I ___to work by train
A have been going B have gone C was going D will have gone 为什么选A
答案
have been doing sth.说明以前工作都乘火车去,以后可能一直这样
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